ARMORY-150 - Review and correct new armoryd code

Make some more changes after a code review.

-Use getAddrForUserString() in order to maximize the ability to send
Bitcoins to addresses, lockboxes, etc.
-Use comma-separated arg pairs in createustxformany() in order to be
more like bitcoind.
-Correct errors from commit e55433fd748d6880c5d994d4f10dae9524f6d7fa.

Note that ArmoryDTiabTest will fail. This appears to be due to commit
e55433fd748d6880c5d994d4f10dae9524f6d7fa.